Opera 11.61 distinguished itself from its rivals with blazing page-load speeds and a great mobile browser, but it came up short in HTML 5 processing. Safari 5.1.2 didn’t perform especially well on any of our benchmarks; its only noteworthy redeeming quality, particularly for Windows users, is the solid security it provides.
from what i have used and tested out i have to say that google chrome is the best its simple and very fast to upload then Firefox, i found it easier to download video from chrome and one feature that i really liked is if a download stop you dont need to go back to the website that you got the download from just go into downloads and click on the link which should automatically stat the new download. saving you a lot of time
One thing like about Firefox is the amount of plugin is offers to the user for a SEO that is really good.
Chrome is also one of the most secure browsers on this list, because it is sandboxed: The plug-ins that Chrome uses access information only within the browser itself and can’t read information from other areas on your computer.
Microsoft’s Internet Explorer 9 earned a rather low score for its features: it doesn’t offer themes for your browser and you can’t synch favourites unless you use Windows Live Mesh. Nevertheless, it offers more security options than most competing browsers, and it processed HTML 5 code quickly.